#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "OLED.h"
#include "Serial.h"

void TIM2_PWM_Init()
{
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    // ????? TIM2 ? GPIO ??
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // GPIO???
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_0; // PA1 ? PA0
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;         // ??????
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // TIM2????
    TIM_TimeBaseStructure.TIM_Period = 20000 - 1;                 // ??????
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;              // ????
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // ??????
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;     // ????
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);             // ???TIM2?????

    // TIM2??2 PWM????
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;           // PWM ??1
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // ????
    TIM_OCInitStructure.TIM_Pulse = 0;                          // ???CCR?
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   // ??????
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);                   // ???TIM2???????2
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);           // ????????

    // TIM2??3 PWM????
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;           // PWM ??1
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // ????
    TIM_OCInitStructure.TIM_Pulse = 0;                          // ???CCR?
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;   // ??????
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);                   // ???TIM2???????1
    TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);           // ????????


    // ??TIM2
    TIM_Cmd(TIM2, ENABLE); // ??TIM2,???????
}